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United States Patent | 5,214,642 |
Kunimoto ,   et al. | May 25, 1993 |
An adaptation processing apparatus for assembling received data units of a fixed length to provide variable length data units and transmitting the variable length data units to a plurality of variable length data unit processors while assembling variable length data units received from said plurality of the variable length data unit processors to provide fixed length data units for transmission thereof. An ATM switching system includes the adaptation processing apparatus, a signal processing unit including the plurality of variable length data unit processors mentioned above, and first-in first-out mechanisms for the variable length data units provided in the adaptation processing apparatus in association with every one of the plural variable length data unit processors.
Inventors: | Kunimoto; Masao (Yokohama, JP); Kashio; Jiro (Kawasaki, JP); Kawakita; Kenji (Yokohama, JP); Gohara; Shinobu (Yokohama, JP); Iwaki; Shinichi (Kamakura, JP); Ichikawa; Hiroyuki (Hino, JP) |
Assignee: | Hitachi, Ltd. (Tokyo, JP); Nippon Telegraph and Telephone Corporation (Tokyo, JP) |
Appl. No.: | 645041 |
Filed: | January 23, 1991 |
Jan 24, 1990[JP] | 2-12541 | |
Aug 24, 1990[JP] | 2-221351 |
Current U.S. Class: | 370/471 |
Intern'l Class: | H04J 003/16; H04Q 011/04 |
Field of Search: | 370/58.1,58.2,58.3,60,60.1,61,79,82,83,94.1,99 |
4910731 | Mar., 1990 | Sakurai et al. | 370/60. |
4956839 | Sep., 1990 | Torii et al. | 370/60. |
5007045 | Apr., 1991 | Tsuzuki | 370/94. |
5062106 | Oct., 1991 | Yamazaki et al. | 370/94. |
5084867 | Jan., 1992 | Tachibana et al. | 370/60. |
5099475 | Mar., 1992 | Kozaki et al. | 370/60. |
5101404 | Mar., 1992 | Kunimoto et al. | 370/60. |
CCITT, The International Telegraph and Telephone Consulative Committee, Blue Book, vol. III, "Integrated Services Digital Network (ISDN) General Structure and Service Capabilities", Recommendations 1.110-1.257, IXTH Plenary Assembly, Melbourne, Nov. 14-25, 1988. Hiroyuki Ichikawa et al., "A Study on Cell Assembling and Disassembling Functions in ATM Networks", NTT Communication Switching Laboratories, National Convention of the Institute of Electronics, Information and Communication Engineers of Japan, Autumn 1989, Paper B-168. Toshikazu Suzuki et al., "A Study on ATM Adaptation Layer Functions", NTT Communication Switching Laboratories, Institute of Electronics, Information and Communication Engineers of Japan, Technical Study Report SSE 89-105. Masao Kunimoto et al., "A Study of Implementation for ATM Protocol", Systems Development Laboratory, Totsuka Works, Hitachi, Ltd., Institute of Electronics, Information and Communication Engineering of Japan, Technical Study Report SSE 88-166. Shirou Tanabe et al., "System Configuration of ATM Switching", Central Research Laboratory, Totsuka Works, System Development Laboratory, Hitachi, Ltd., Institute of Electronics, Information and Communication Engineers of Japan, Technical Study Report SSE 89-53. Yasuharu Kohj et al., "A Study on ATM Signalling Method Which Takes Account of Meta-Signalling Procedure", Totsuka Works, Hitachi, Ltd., National Convention of the Institute of Electronics, Information and Communication Engineers of Japan, Autumn 1989, p. B-169. Noboru Endo et al., "A Memory Switch Architecture for ATM Switching Network", Institute of Electronics, Information and Communication Engineering of Japan, Technical Report SSE 88-56, pp. 37-42. (Provided in Japanese). |